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Grayscale iPods: Bit-flipped the 2bit LCD driver to use the same format as apple. No more mirrored display when loading retailos, after a bootloader update.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@9478 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jens Arnold 2006-04-04 00:55:16 +00:00
parent ec5f783988
commit fcab617331
3 changed files with 39 additions and 43 deletions
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33
firmware/drivers/lcd-2bit-horz.c
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@ -46,7 +46,7 @@ static const unsigned char dibits[16] ICONST_ATTR = {
};
static const unsigned char pixmask[4] ICONST_ATTR = {
0x03, 0x0C, 0x30, 0xC0
0xC0, 0x30, 0x0C, 0x03
};
static unsigned fg_pattern IDATA_ATTR = 0xFF; /* initially black */
@ -381,8 +381,8 @@ void lcd_hline(int x1, int x2, int y)
bfunc = lcd_blockfuncs[drawmode];
dst = &lcd_framebuffer[y][x1>>2];
nx = x2 - (x1 & ~3);
mask = 0xFFu << (2 * (x1 & 3));
mask_right = 0xFFu >> (2 * (~nx & 3));
mask = 0xFFu >> (2 * (x1 & 3));
mask_right = 0xFFu << (2 * (~nx & 3));
for (; nx >= 4; nx -= 4)
{
@ -479,8 +479,8 @@ void lcd_fillrect(int x, int y, int width, int height)
bfunc = lcd_blockfuncs[drawmode];
dst = &lcd_framebuffer[y][x>>2];
nx = width - 1 + (x & 3);
mask = 0xFFu << (2 * (x & 3));
mask_right = 0xFFu >> (2 * (~nx & 3));
mask = 0xFFu >> (2 * (x & 3));
mask_right = 0xFFu << (2 * (~nx & 3));
for (; nx >= 4; nx -= 4)
{
@ -515,9 +515,7 @@ void lcd_fillrect(int x, int y, int width, int height)
* at top.
* The bytes are stored in row-major order, with byte 0 being top left,
* byte 1 2nd from left etc. The first row of bytes defines pixel row
* 0, the second row defines pixel row 1 etc.
*
* This is similar to the internal lcd hw format. */
* 0, the second row defines pixel row 1 etc. */
/* Draw a partial monochrome bitmap */
void lcd_mono_bitmap_part(const unsigned char *src, int src_x, int src_y,
@ -602,7 +600,7 @@ void lcd_mono_bitmap(const unsigned char *src, int x, int y, int width, int heig
*
* A bitmap contains two bits for every pixel. 00 = white, 01 = light grey,
* 10 = dark grey, 11 = black. Bits within a byte are arranged horizontally,
* LSB at the left.
* MSB at the left.
* The bytes are stored in row-major order, with byte 0 being top left,
* byte 1 2nd from left etc. Each row of bytes defines one pixel row.
*
@ -651,8 +649,8 @@ void lcd_bitmap_part(const unsigned char *src, int src_x, int src_y,
shift = x & 3;
nx = width - 1 + shift + src_x;
mask = 0xFFu << (2 * (shift + src_x));
mask_right = 0xFFu >> (2 * (~nx & 3));
mask = 0xFF00u >> (2 * (shift + src_x));
mask_right = 0xFFu << (2 * (~nx & 3));
shift *= 2;
dst_end = dst + height * LCD_FBWIDTH;
@ -660,26 +658,25 @@ void lcd_bitmap_part(const unsigned char *src, int src_x, int src_y,
{
const unsigned char *src_row = src;
unsigned char *dst_row = dst;
unsigned mask_row = mask;
unsigned mask_row = mask >> 8;
unsigned data = 0;
for (x = nx; x >= 4; x -= 4)
{
data |= *src_row++ << shift;
data = (data << 8) | *src_row++;
if (mask_row & 0xFF)
{
setblock(dst_row, mask_row, data);
setblock(dst_row, mask_row, data >> shift);
mask_row = 0xFF;
}
else
mask_row >>= 8;
mask_row = mask;
dst_row++;
data >>= 8;
}
data |= *src_row << shift;
setblock(dst_row, mask_row & mask_right, data);
data = (data << 8) | *src_row;
setblock(dst_row, mask_row & mask_right, data >> shift);
src += stride;
dst += LCD_FBWIDTH;